[7.x] Implement ml/data_frame/analytics/_estimate_memory_usage API en…

…dpoint (#45188) (#45510)

docs/reference/ml/df-analytics/apis/estimate-memory-usage-dfanalytics.asciidoc

@@ -0,0 +1,83 @@
+[role="xpack"]
+[testenv="platinum"]
+[[estimate-memory-usage-dfanalytics]]
+=== Estimate memory usage API
+
+[subs="attributes"]
+++++
+<titleabbrev>Estimate memory usage for {dfanalytics-jobs}</titleabbrev>
+++++
+
+Estimates memory usage for the given {dataframe-analytics-config}.
+
+experimental[]
+
+[[ml-estimate-memory-usage-dfanalytics-request]]
+==== {api-request-title}
+
+`POST _ml/data_frame/analytics/_estimate_memory_usage`
+
+[[ml-estimate-memory-usage-dfanalytics-prereq]]
+==== {api-prereq-title}
+
+* You must have `monitor_ml` privilege to use this API. For more 
+information, see {stack-ov}/security-privileges.html[Security privileges] and 
+{stack-ov}/built-in-roles.html[Built-in roles].
+
+[[ml-estimate-memory-usage-dfanalytics-desc]]
+==== {api-description-title}
+
+This API estimates memory usage for the given {dataframe-analytics-config} before the {dfanalytics-job} is even created.
+
+Serves as an advice on how to set `model_memory_limit` when creating {dfanalytics-job}.
+
+[[ml-estimate-memory-usage-dfanalytics-request-body]]
+==== {api-request-body-title}
+
+`data_frame_analytics_config`::
+  (Required, object) Intended configuration of {dfanalytics-job}. For more information, see
+  <<ml-dfanalytics-resources>>.
+  Note that `id` and `dest` don't need to be provided in the context of this API.
+
+[[ml-estimate-memory-usage-dfanalytics-results]]
+==== {api-response-body-title}
+
+`expected_memory_usage_with_one_partition`::
+  (string) Estimated memory usage under the assumption that the whole {dfanalytics} should happen in memory
+  (i.e. without overflowing to disk).
+
+`expected_memory_usage_with_max_partitions`::
+  (string) Estimated memory usage under the assumption that overflowing to disk is allowed during {dfanalytics}.
+  `expected_memory_usage_with_max_partitions` is usually smaller than `expected_memory_usage_with_one_partition`
+  as using disk allows to limit the main memory needed to perform {dfanalytics}.
+
+[[ml-estimate-memory-usage-dfanalytics-example]]
+==== {api-examples-title}
+
+[source,js]
+--------------------------------------------------
+POST _ml/data_frame/analytics/_estimate_memory_usage
+{
+  "data_frame_analytics_config": {
+    "source": {
+      "index": "logdata"
+    },
+    "analysis": {
+      "outlier_detection": {}
+    }
+  }
+}
+--------------------------------------------------
+// CONSOLE
+// TEST[skip:TBD]
+
+The API returns the following results:
+
+[source,js]
+----
+{
+  "expected_memory_usage_with_one_partition": "128MB",
+  "expected_memory_usage_with_max_partitions": "32MB"
+}
+----
+// TESTRESPONSE

docs/reference/ml/df-analytics/apis/index.asciidoc

@@ -12,6 +12,7 @@ You can use the following APIs to perform {ml} {dfanalytics} activities.
 * <<start-dfanalytics,Start {dfanalytics-jobs}>>
 * <<stop-dfanalytics,Stop {dfanalytics-jobs}>>
 * <<evaluate-dfanalytics,Evaluate {dfanalytics}>>
+* <<estimate-memory-usage-dfanalytics,Estimate memory usage for {dfanalytics}>>
 
 See also <<ml-apis>>. 
 
@@ -21,10 +22,11 @@ include::put-dfanalytics.asciidoc[]
 include::delete-dfanalytics.asciidoc[]
 //EVALUATE
 include::evaluate-dfanalytics.asciidoc[]
+//ESTIMATE_MEMORY_USAGE
+include::estimate-memory-usage-dfanalytics.asciidoc[]
 //GET
 include::get-dfanalytics.asciidoc[]
 include::get-dfanalytics-stats.asciidoc[]
 //SET/START/STOP
 include::start-dfanalytics.asciidoc[]
 include::stop-dfanalytics.asciidoc[]
-

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/XPackClientPlugin.java

@@ -96,6 +96,7 @@
 import org.elasticsearch.xpack.core.ml.action.DeleteForecastAction;
 import org.elasticsearch.xpack.core.ml.action.DeleteJobAction;
 import org.elasticsearch.xpack.core.ml.action.DeleteModelSnapshotAction;
+import org.elasticsearch.xpack.core.ml.action.EstimateMemoryUsageAction;
 import org.elasticsearch.xpack.core.ml.action.EvaluateDataFrameAction;
 import org.elasticsearch.xpack.core.ml.action.FinalizeJobExecutionAction;
 import org.elasticsearch.xpack.core.ml.action.FindFileStructureAction;
@@ -347,6 +348,7 @@ public List<ActionType<? extends ActionResponse>> getClientActions() {
                 StartDataFrameAnalyticsAction.INSTANCE,
                 StopDataFrameAnalyticsAction.INSTANCE,
                 EvaluateDataFrameAction.INSTANCE,
+                EstimateMemoryUsageAction.INSTANCE,
                 // security
                 ClearRealmCacheAction.INSTANCE,
                 ClearRolesCacheAction.INSTANCE,

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/ml/action/EstimateMemoryUsageAction.java

@@ -0,0 +1,204 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+package org.elasticsearch.xpack.core.ml.action;
+
+import org.elasticsearch.action.ActionRequest;
+import org.elasticsearch.action.ActionRequestValidationException;
+import org.elasticsearch.action.ActionResponse;
+import org.elasticsearch.action.ActionType;
+import org.elasticsearch.common.Nullable;
+import org.elasticsearch.common.ParseField;
+import org.elasticsearch.common.io.stream.StreamInput;
+import org.elasticsearch.common.io.stream.StreamOutput;
+import org.elasticsearch.common.unit.ByteSizeValue;
+import org.elasticsearch.common.xcontent.ConstructingObjectParser;
+import org.elasticsearch.common.xcontent.ObjectParser;
+import org.elasticsearch.common.xcontent.ToXContentObject;
+import org.elasticsearch.common.xcontent.XContentBuilder;
+import org.elasticsearch.common.xcontent.XContentParser;
+import org.elasticsearch.xpack.core.ml.dataframe.DataFrameAnalyticsConfig;
+import org.elasticsearch.xpack.core.ml.utils.ExceptionsHelper;
+
+import java.io.IOException;
+import java.util.Objects;
+
+import static org.elasticsearch.common.xcontent.ConstructingObjectParser.constructorArg;
+import static org.elasticsearch.common.xcontent.ConstructingObjectParser.optionalConstructorArg;
+
+public class EstimateMemoryUsageAction extends ActionType<EstimateMemoryUsageAction.Response> {
+
+    public static final EstimateMemoryUsageAction INSTANCE = new EstimateMemoryUsageAction();
+    public static final String NAME = "cluster:admin/xpack/ml/data_frame/analytics/estimate_memory_usage";
+
+    private EstimateMemoryUsageAction() {
+        super(NAME, EstimateMemoryUsageAction.Response::new);
+    }
+
+    public static class Request extends ActionRequest implements ToXContentObject {
+
+        private static final ParseField DATA_FRAME_ANALYTICS_CONFIG = new ParseField("data_frame_analytics_config");
+
+        private static final ConstructingObjectParser<EstimateMemoryUsageAction.Request, Void> PARSER =
+            new ConstructingObjectParser<>(
+                NAME,
+                args -> {
+                    DataFrameAnalyticsConfig.Builder configBuilder = (DataFrameAnalyticsConfig.Builder) args[0];
+                    DataFrameAnalyticsConfig config = configBuilder.buildForMemoryEstimation();
+                    return new EstimateMemoryUsageAction.Request(config);
+                });
+
+        static {
+            PARSER.declareObject(constructorArg(), DataFrameAnalyticsConfig.STRICT_PARSER, DATA_FRAME_ANALYTICS_CONFIG);
+        }
+
+        public static EstimateMemoryUsageAction.Request parseRequest(XContentParser parser) {
+            return PARSER.apply(parser, null);
+        }
+
+        private final DataFrameAnalyticsConfig config;
+
+        public Request(DataFrameAnalyticsConfig config) {
+            this.config = ExceptionsHelper.requireNonNull(config, DATA_FRAME_ANALYTICS_CONFIG);
+        }
+
+        public Request(StreamInput in) throws IOException {
+            super(in);
+            this.config = new DataFrameAnalyticsConfig(in);
+        }
+
+        @Override
+        public ActionRequestValidationException validate() {
+            return null;
+        }
+
+        public DataFrameAnalyticsConfig getConfig() {
+            return config;
+        }
+
+        @Override
+        public void writeTo(StreamOutput out) throws IOException {
+            super.writeTo(out);
+            config.writeTo(out);
+        }
+
+        @Override
+        public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
+            builder.startObject();
+            builder.field(DATA_FRAME_ANALYTICS_CONFIG.getPreferredName(), config);
+            builder.endObject();
+            return builder;
+        }
+
+        @Override
+        public boolean equals(Object other) {
+            if (this == other) {
+                return true;
+            }
+            if (other == null || getClass() != other.getClass()) {
+                return false;
+            }
+
+            Request that = (Request) other;
+            return Objects.equals(config, that.config);
+        }
+
+        @Override
+        public int hashCode() {
+            return Objects.hash(config);
+        }
+    }
+
+    public static class Response extends ActionResponse implements ToXContentObject {
+
+        public static final ParseField TYPE = new ParseField("memory_usage_estimation_result");
+
+        public static final ParseField EXPECTED_MEMORY_USAGE_WITH_ONE_PARTITION =
+            new ParseField("expected_memory_usage_with_one_partition");
+        public static final ParseField EXPECTED_MEMORY_USAGE_WITH_MAX_PARTITIONS =
+            new ParseField("expected_memory_usage_with_max_partitions");
+
+        static final ConstructingObjectParser<Response, Void> PARSER =
+            new ConstructingObjectParser<>(
+                TYPE.getPreferredName(),
+                args -> new Response((ByteSizeValue) args[0], (ByteSizeValue) args[1]));
+
+        static {
+            PARSER.declareField(
+                optionalConstructorArg(),
+                (p, c) -> ByteSizeValue.parseBytesSizeValue(p.text(), EXPECTED_MEMORY_USAGE_WITH_ONE_PARTITION.getPreferredName()),
+                EXPECTED_MEMORY_USAGE_WITH_ONE_PARTITION,
+                ObjectParser.ValueType.VALUE);
+            PARSER.declareField(
+                optionalConstructorArg(),
+                (p, c) -> ByteSizeValue.parseBytesSizeValue(p.text(), EXPECTED_MEMORY_USAGE_WITH_MAX_PARTITIONS.getPreferredName()),
+                EXPECTED_MEMORY_USAGE_WITH_MAX_PARTITIONS,
+                ObjectParser.ValueType.VALUE);
+        }
+
+        private final ByteSizeValue expectedMemoryUsageWithOnePartition;
+        private final ByteSizeValue expectedMemoryUsageWithMaxPartitions;
+
+        public Response(@Nullable ByteSizeValue expectedMemoryUsageWithOnePartition,
+                        @Nullable ByteSizeValue expectedMemoryUsageWithMaxPartitions) {
+            this.expectedMemoryUsageWithOnePartition = expectedMemoryUsageWithOnePartition;
+            this.expectedMemoryUsageWithMaxPartitions = expectedMemoryUsageWithMaxPartitions;
+        }
+
+        public Response(StreamInput in) throws IOException {
+            super(in);
+            this.expectedMemoryUsageWithOnePartition = in.readOptionalWriteable(ByteSizeValue::new);
+            this.expectedMemoryUsageWithMaxPartitions = in.readOptionalWriteable(ByteSizeValue::new);
+        }
+
+        public ByteSizeValue getExpectedMemoryUsageWithOnePartition() {
+            return expectedMemoryUsageWithOnePartition;
+        }
+
+        public ByteSizeValue getExpectedMemoryUsageWithMaxPartitions() {
+            return expectedMemoryUsageWithMaxPartitions;
+        }
+
+        @Override
+        public void writeTo(StreamOutput out) throws IOException {
+            out.writeOptionalWriteable(expectedMemoryUsageWithOnePartition);
+            out.writeOptionalWriteable(expectedMemoryUsageWithMaxPartitions);
+        }
+
+        @Override
+        public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
+            builder.startObject();
+            if (expectedMemoryUsageWithOnePartition != null) {
+                builder.field(
+                    EXPECTED_MEMORY_USAGE_WITH_ONE_PARTITION.getPreferredName(), expectedMemoryUsageWithOnePartition.getStringRep());
+            }
+            if (expectedMemoryUsageWithMaxPartitions != null) {
+                builder.field(
+                    EXPECTED_MEMORY_USAGE_WITH_MAX_PARTITIONS.getPreferredName(), expectedMemoryUsageWithMaxPartitions.getStringRep());
+            }
+            builder.endObject();
+            return builder;
+        }
+
+        @Override
+        public boolean equals(Object other) {
+            if (this == other) {
+                return true;
+            }
+            if (other == null || getClass() != other.getClass()) {
+                return false;
+            }
+
+            Response that = (Response) other;
+            return Objects.equals(expectedMemoryUsageWithOnePartition, that.expectedMemoryUsageWithOnePartition)
+                && Objects.equals(expectedMemoryUsageWithMaxPartitions, that.expectedMemoryUsageWithMaxPartitions);
+        }
+
+        @Override
+        public int hashCode() {
+            return Objects.hash(expectedMemoryUsageWithOnePartition, expectedMemoryUsageWithMaxPartitions);
+        }
+    }
+}